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23 September 1998 Energetic disorder in organic polymeric photoconductors
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Proceedings Volume 3488, Nonlinear Optics of Liquid and Photorefractive Crystals II; (1998)
Event: International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals, 1997, Partenit, Crimea, Ukraine
The low-temperature thermoluminescense (TSL) technique has been applied for probing the energetic disorder of localized states in poly(methyl-phenylsilylene) (PMPSi) combining the TSL studies and transport properties as determined by photocurrent transients. The results are described in terms of the disorder model and the energetic relaxation of photogenerated charge carriers within a manifold of the states of Gaussian distribution. Analysis both of the energetic position of the TSL peak maximum and the shape of its high energy wing allowed to extract a parameter characterized the intrinsic energetic disorder in PMPSi, the value of which coincided well with the width of the density-of-states determined from transport measurements. The interpretation of results leads to conclusion that although the disorder is the dominant factor, the polaron contribution should be taken into account for the description of the charge carrier transport in PMIPSi. The problem of the photochemical stability of PMPSi as well as the appearance of new trapping centers, is briefly outlined.

Keywords: organic polymeric photoconductors, poly(mcthyl-phenylsilylene), energetic disorder, charge carrier transport, thermoluminescence.
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A. Kadashchuk, Stanislav Nespurek, N. Ostapenko, and V. Zaika "Energetic disorder in organic polymeric photoconductors", Proc. SPIE 3488, Nonlinear Optics of Liquid and Photorefractive Crystals II, (23 September 1998);

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